it all depends on what needs fixed- the pump is about $1200, the accumulators- a maintenence item, are $80-$140 each, the struts are $375 each, the valve can be rebuilt for under $100, the lines are cheap, the hoses and fittings are hard to find. the fluid is $12/lt, it goes on and on.
i have heard success and horror stories of replacing the sls with air shocks, etc.
as i use mine as a work truck(trim carpenter), i could never get by without it.

good luck....

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1984 123.193 372,xxx miles, room for Seven.

1999 Dodge Durango Cummins 4BTAA 47RE 5k lb 4x4 getting 25+mpgs, room for Seven.